<template>
  <div class="scan" v-if="scancode">
    <qrcode-stream @decode="onDecode" @init="onInit" style="height: 100vh;width:100vh">
      <el-button type="primary" size="mini" @click="closeScan" style="width:150px">关闭扫码</el-button>
      <div style="width:100%;height:100%">
        <div class="qr-scanner">
          <div class="box">
            <div class="line"></div>
            <div class="angle"></div>
          </div>
        </div>
      </div>
    </qrcode-stream>
  </div>
</template>
<script>
// 下载插件
// cnpm install --save  vue-qrcode-reader
// 引入
import { QrcodeStream } from "vue-qrcode-reader";
export default {
  // 注册
  components: { QrcodeStream },
  props: {
    scancode: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      result: "", // 扫码结果信息
      error: "" // 错误信息
    };
  },
  created() {
    this.clickCode();
  },
  mounted() {},
  methods: {
    closeScan() {
      this.$emit("closeCamera");
    },
    clickCode() {
      this.state = true;
    },
    //回调扫描结果
    onDecode(result) {
      if (result !== "") {
        this.scancode = false;
        this.$emit("ok", result);
        this.$message.success(result);
      }
    },
    // 检查是否调用摄像头
    async onInit(promise) {
      try {
        await promise;
      } catch (error) {
        if (error.name === "NotAllowedError") {
          this.error = "ERROR: 您需要授予相机访问权限";
        } else if (error.name === "NotFoundError") {
          this.error = "ERROR: 这个设备上没有摄像头";
        } else if (error.name === "NotSupportedError") {
          this.error = "ERROR: 所需的安全上下文(HTTPS、本地主机)";
        } else if (error.name === "NotReadableError") {
          this.error = "ERROR: 相机被占用";
        } else if (error.name === "OverconstrainedError") {
          this.error = "ERROR: 安装摄像头不合适";
        } else if (error.name === "StreamApiNotSupportedError") {
          this.error = "ERROR: 此浏览器不支持流API";
        }
      }
    }
  }
};
</script>
<style scoped>
.error {
  font-weight: bold;
  color: red;
}
</style>
<style scoped>
.scan {
  width: 100%;
  border-color: #585858;
  position: fixed;
  top: 0;
  left: 0;
}
.qrcode-stream-camera {
  width: 100%;
  height: 100%;
  display: block;
  -o-object-fit: cover;
  object-fit: cover;
  position: absolute;
  top: 0%;
  left: 0%;
}
.qr-scanner {
  background-image: linear-gradient(
      0deg,
      transparent 24%,
      rgba(32, 255, 77, 0.1) 25%,
      rgba(32, 255, 77, 0.1) 26%,
      transparent 27%,
      transparent 74%,
      rgba(32, 255, 77, 0.1) 75%,
      rgba(32, 255, 77, 0.1) 76%,
      transparent 77%,
      transparent
    ),
    linear-gradient(
      90deg,
      transparent 24%,
      rgba(32, 255, 77, 0.1) 25%,
      rgba(32, 255, 77, 0.1) 26%,
      transparent 27%,
      transparent 74%,
      rgba(32, 255, 77, 0.1) 75%,
      rgba(32, 255, 77, 0.1) 76%,
      transparent 77%,
      transparent
    );
  background-size: 3rem 3rem;
  background-position: -1rem -1rem;
  width: 100vh;
  /* height: 100%; */
  height: 100vh;
  position: relative;
  background-color: #1110;

  /* background-color: #111; */
}

.qr-scanner .box {
  width: 60%;
  height: 60%;
  position: absolute;
  left: 50%;
  top: 40%;
  transform: translate(-50%, -50%);
  overflow: hidden;
  border: 0.1rem solid rgba(0, 255, 51, 0.2);
  /* background: url('http://resource.beige.world/imgs/gongconghao.png') no-repeat center center; */
}

.qr-scanner .line {
  height: calc(100% - 2px);
  width: 100%;
  background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
  border-bottom: 3px solid #00ff33;
  transform: translateY(-100%);
  animation: radar-beam 2s infinite alternate;
  animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
  animation-delay: 1.4s;
}

.qr-scanner .box:after,
.qr-scanner .box:before,
.qr-scanner .angle:after,
.qr-scanner .angle:before {
  content: "";
  display: block;
  position: absolute;
  width: 3vw;
  height: 3vw;

  border: 0.2rem solid transparent;
}

.qr-scanner .box:after,
.qr-scanner .box:before {
  top: 0;
  border-top-color: #00ff33;
}

.qr-scanner .angle:after,
.qr-scanner .angle:before {
  bottom: 0;
  border-bottom-color: #00ff33;
}

.qr-scanner .box:before,
.qr-scanner .angle:before {
  left: 0;
  border-left-color: #00ff33;
}

.qr-scanner .box:after,
.qr-scanner .angle:after {
  right: 0;
  border-right-color: #00ff33;
}

@keyframes radar-beam {
  0% {
    transform: translateY(-100%);
  }

  100% {
    transform: translateY(0);
  }
}
</style>